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PDF MAX9777 Data sheet ( Hoja de datos )
| Número de pieza | MAX9777 | |
| Descripción | Stereo 3W Audio Power Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
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19-0509; Rev 0; 4/06
www.DataSheet4U.com
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
General Description
The MAX9777/MAX9778 combine a stereo 3W bridge-
tied load (BTL) audio power amplifier, stereo single-
ended (SE) headphone amplifier, headphone sensing,
and a 2:1 input multiplexer all in a tiny 28-pin thin QFN
package. These devices operate from a single 4.5V to
5.5V supply and feature an industry-leading 100dB
PSRR, allowing these devices to operate from noisy
supplies without the addition of a linear regulator. An
ultra-low 0.002% THD+N ensures clean, low-distortion
amplification of the audio signal. Patented click-and-
pop suppression minimizes audible transients on power
and shutdown cycles. Power-saving features include
low 4mV VOS (minimizes DC current drain through the
speakers), low 13mA supply current, and a 10µA shut-
down mode. A MUTE function allows the outputs to be
quickly enabled or disabled.
A headphone sense input detects the presence of a
headphone jack and automatically configures the
amplifiers for either speaker or headphone mode. In
speaker mode, the amplifiers can deliver up to 3W of
continuous average power into a 3Ω load. In head-
phone mode, the amplifier can deliver up to 200mW of
continuous average power into a 16Ω load. The gain of
the amplifiers is externally set, allowing maximum flexi-
bility in optimizing output levels for a given load. The
amplifiers also feature a 2:1 input multiplexer, allowing
multiple audio sources to be selected. The multiplexer
can also be used to compensate for limitations in the
frequency response of the loud speakers by selecting
an external equalizer network. The various functions are
controlled by either an I2C†-compatible (MAX9777) or
simple parallel control interface (MAX9778).
The MAX9777/MAX9778 are available in a thermally
efficient 28-pin thin QFN package (5mm x 5mm x
0.8mm). These devices have thermal-overload protec-
tion (OVP) and are specified over the extended -40°C
to +85°C temperature range.
Applications
Features
o Industry-Leading, Ultra-High 100dB PSRR
o PC99/01 Compliant
o 3W BTL Stereo Speaker Amplifier
o 200mW Stereo Headphone Amplifier
o Low 0.002% THD+N
o Patented Click-and-Pop Suppression
o ESD-Protected Outputs
o Low Quiescent Current: 13mA
o Low-Power Shutdown Mode: 10µA
o MUTE Function
o Headphone Sense Input
o Stereo 2:1 Input Multiplexer
o Optional 2-Wire, I2C-Compatible or Parallel
Interface
o Tiny 28-Pin Thin QFN (5mm x 5mm x 0.8mm)
Package
Ordering Information
PART
CONTROL PIN-
INTERFACE PACKAGE
PKG
CODE
MAX9777ETI+ I2C Compatible 28 Thin QFN-EP* T2855-6
MAX9778ETI+
Parallel
28 Thin QFN-EP* T2855-6
Note: All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Pin Configurations and Functional Diagrams appear at end
of data sheet.
Simplified Block Diagram
SINGLE SUPPLY
4.5V TO 5.5V
LEFT IN1
LEFT IN2
Notebooks
Portable DVD Players
Tablet PCs
PC Audio Peripherals
Camcorders
Multimedia Monitor
RIGHT IN1
RIGHT IN2
SE/
BTL
†Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associate Companies, conveys a
license under the Philips I2C Patent Rights to use these compo-
nents in an I2C system, provided that the system conforms to the
I2C Standard Specification defined by Philips.
CONTROL
I2C-
COMPATIBLE
MAX9777
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
Typical Operating Characteristics
(VDD = PVDD = 5V, GND = PGND = 0V, VSHDN = 5V, CBIAS = 1µF, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
RL = 3Ω
AV = 2V/V
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
RL = 3Ω
AV = 4V/V
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
RL = 4Ω
AV = 2V/V
0.1
POUT = 500mW POUT = 1W
0.01
POUT = 2W POUT = 2.5W
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
RL = 4Ω
AV = 4V/V
0.1
POUT = 500mW POUT = 1W
0.1
POUT = 250mW POUT = 500mW
0.01
POUT = 2W
POUT = 2.5W
0.01
POUT = 1W
POUT = 2W
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
RL = 8Ω
AV = 2V/V
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
1
RL = 8Ω
AV = 4V/V
0.1
POUT = 250mW POUT = 500mW
0.01
POUT = 1W
POUT = 2W
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 2V/V
RL = 3Ω
10
0.1
POUT = 250mW POUT = 500mW
0.01
0.1
POUT = 250mW POUT = 500mW
0.01
0.001
10
POUT = 1W POUT = 1.2W
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 4V/V
RL = 3Ω
10
0.001
10
POUT = 1W POUT = 1.2W
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
100
AV = 2V/V
RL = 4Ω
10
1
0.1
0.01
0.001
0
f = 10kHz
f = 20Hz
f = 1kHz
123
OUTPUT POWER (W)
1 f = 10kHz
f = 1kHz
0.1
0.01
f = 20Hz
0.001
40
123
OUTPUT POWER (W)
1
0.1
f = 10kHz
f = 1kHz
0.01
f = 20Hz
0.001
4 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT POWER (W)
_______________________________________________________________________________________ 5
5 Page 
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Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
PIN
MAX9777
1
2
3, 4
5
6
7
8
9, 13, 23, 27
MAX9778
—
—
3, 4
5
6
7
8
9, 13, 23, 27
10 10
11, 25
12
14
11, 25
12
14
15 —
16 16
17 17
18 18
19 19
20 20
21 21
22 22
24 24
26 26
28 —
—1
—2
— 15
— 28
EP EP
Pin Description
NAME
SDA
INT
VDD
INL1
INL2
GAINLA
GAINLB
PGND
OUTL+
PVDD
OUTL-
SHDN
ADD
HPS
BIAS
GND
INR1
INR2
GAINRA
GAINRB
OUTR+
OUTR-
SCL
MUTE
HPS_EN
GAINA/B
IN1/2
EP
FUNCTION
Serial Data I/O
Interrupt Output
Power-Supply Input
Left-Channel Input 1
Left-Channel Input 2
Left-Channel Gain Set A
Left-Channel Gain Set B
Power Ground. Connect to GND.
Left-Channel Bridged Amplifier Positive Output. OUTL+ also serves as the
left-channel headphone amplifier output.
Output Amplifier Power Supply
Left-Channel Bridged Amplifier Negative Output
Active-Low Shutdown Input. Connect SHDN to VDD for normal operation.
Address Select. A logic-high sets the address LSB to 1, a logic-low sets the
address LSB to zero.
Headphone Sense Input. A logic-high configures the device as a single-
ended headphone amp. A logic-low configures the device as a BTL
speaker amp.
DC Bias Bypass Terminal. See the BIAS Capacitor section for capacitor
selection. Connect CBIAS from BIAS to GND.
Ground. Connect to PGND.
Right-Channel Input 1
Right-Channel Input 2
Right-Channel Gain Set A
Right-Channel Gain Set B
Right-Channel Bridged Amplifier Positive Output. OUTR+ also serves as the
right-channel headphone amplifier output.
Right-Channel Bridged Amplifier Negative Output
Serial Clock Line
Active-High Mute Input
Headphone Enable. A logic-high enables HPS. A logic-low disables HPS
and the device is always configured as a BTL speaker amplifier.
Gain Select. A logic-low selects the gain set by GAIN_A. A logic-high
selects the gain set by GAIN_B.
Input Select. A logic-low selects amplifier input 1. A logic-high selects
amplifier input 2.
Exposed Paddle. Connect to GND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet MAX9777.PDF ] | |
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